40 



CALIFORNIA ACADEMY OF SCIENCKS. 



somites x, xi and xii, connecting the doi'sal and ventral vessels. There are also 

 connections between those two vessels in ix, x and xiii as in the other species, but 

 those connections consist of regular secondary vessels narrow and tubular, and in no 

 way resembling hearts. There is no subneural vessel. The ventral vessel is divided 

 in somite vi, and in the anterior six somites there is a heavy capillaiy system connect- 

 ing the ventral and dorsal vessels. 



In the following I have endeavored to give a comjiarative table of the species 

 which I refer to Deltania. As far as concerns those species which I have not myself 

 investigated the table must be considered tentative, especially so in regard to the char- 

 acter of D. duhia, the description of which by Fletcher is somewhat insufficient. I need 

 here hardly add ih&i Ddtanln FouUonl is the species described from Maderia by Bed- 

 dard as Microscolex pouUoni. The description given for D. chihin is taken from Rosa's 

 description of Microscolex chibius Fletcher, and not from Fletcher's own. 



DELTANIA. 



D. clfijans u. sjj. D. Troijcri n. sp. D. Beiihami n. sp. D. PouUoni Bedd. J), dubia Kosa. 



vi, vii, viii, ix. v, vi, vii, viii. v, vi, vii, viii. Not present. 



xi, xii. xi, xii. 



Sc^ifal ijlauih ill 

 Sjierm-sat's in 

 Spcrmalheca 



XI, Xll. 



X, XI. 



Very small and Large, apart, with Large, close togeth- Not present. 

 pellucid. No di- 2 diverticula each, er, with 2 diverti- 

 verticula. , Opaque. culaeach. Opaque 



XI, Xll. 



Not present. 



The ventral or inner Only a little closer Only a little closer Several times closer Several times clos- Several times clos- 

 sedf in each couple' together than the together than together than er together than er than the outer 

 exclusive of thosej setue of the outer those of the outer those of the outer the outer couple. i couple, 

 in the genital re- couple. couple. couple, 



aion, are: \ 



Prosfa^e, the gland-|Helix-like at the Not helix-like; tub- Not helix-like; tub- 

 ular part top. Muscular ular, straight or ular and broad at 

 ' part not very bent. the base. Top en- 



short. 



Ohzard 



Diverticula of the 

 spcrmalheca 



Pcnial sctiv 



Ncphridia com- 

 mence in 



None. 

 Absent. 



None. 



larged knob-like. 

 None. 



None. 



Helix-like at the 

 top. Muscular 

 part very short. 



Eudimeutary. 



More than tas large About i as large as 

 as the spermathc- the spermathecal 

 cal pouch. pouch. 



Two on each side. Two ou each side. Two on each side. One on each side. Two on each side. 



Nephridio-pores in 4th and 3d seta-, 

 front of and little Prominent in the 



interior to 

 Sjiin-mducts 



clitellum. 



Remain separate 

 up to the atria. 



Posteriorly to the xxvi and xxvii. 

 clitellum the setiel 

 have regained their; 

 normal distance in 

 somite 



4th and 3d setae. 4th and .3d seta. 



Remain separate up 

 to the atria. 



Remain separate up 

 to the atria. 



3d seta-, 3d seta-. 



Not prominent in 

 the clitellum. 



Remain separate Unite to form one 



up to the atria. tube ou each side 



which opens in 



the muscular part 



of the atrium. 



xxiii and xxiv. 



